JFET_V2_N3_RP3 C.S. Ravichandran S. Subha Rani V. Sundarapandian Journal on Future Engineering and Technology 2230 – 7184 2 3 41 46 System order reduction, Dominance measure, Discrete time linear system A straightforward method for high order system simplification is proposed that gives in exact models of lower orders. This paper establishes a design for subsets of selective state vector of linear time invariant discrete time multivariable system. By the help of dominance measures, the dominant eigen values can be retained in the reduced order of the system. This is needed to identify the state variables that have significant participation in a selected mode. The computations involved in the design of large order system can be minimized with the help of suitable reduced order models. A numerical example is given to illustrate the design method. February - April 2007 Copyright © 2007 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=818